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Old 04-04-2008, 07:18 PM   #1 (permalink)
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Howdy Riders,

When I get out of the car after parking it smells like its running rich? It has that strong exhaust/fuel smell. The engine is a older 302, the carb- Autolite 2100D 2V just rebuilt, car starts and runs great and the fuel / air mixture screws were adjusted the usual way-

While the car was at idle and warm I turn in one screw in till it bogged down a bit then turned it back out 1/2 turn....did the same with the other screw.

Turning those scews in is lean correct and
is there other possible reasons for the smell?

NOTE: I'm using the Eldelbrock air cleaner seen here and my butterfly is open when hot.

Thanks in advance.

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Old 04-04-2008, 07:46 PM   #2 (permalink)
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I ran down a similar problem with my car for over a year and finally found the answer. In my case the car was blowing black smoke out the tail pipes so bad that my garage was covered with soot. I finally resealed the intake manifold gaskets, dropped the jets two sizes and changed the power valve. All is well now and my car runs clean without fouling the spark plugs. Here's a few causes – internal and external vacuums leaks, timing problems, power valve blown or not matched to the idle vacuum, internal leaks in the carb or just a worn out engine. Put a vacuum gauge on your engine and start from there. You'll feel better once you find out what's really going on inside your engine. It worked for me...
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Old 04-04-2008, 08:16 PM   #3 (permalink)
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The screws you adjusted are for the idle circuit only. It's very possible that the jets are too big...meaning it runs rich when the throttle is open.
Dave
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Old 04-05-2008, 03:20 AM   #4 (permalink)
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Thanks guys.

I'll look into those ASAP.

Are the original factory jets too large and If I go to smaller ones can I get better gas mileage?

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Old 04-05-2008, 11:00 AM   #5 (permalink)
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The factory jets should be fine. The question is what's currently in the carb.

If you are running rich, your gas mileage is not as good as it could be.

Another thought came to mind. Is your float height OK. If it's too high, that will cause it to run rich. It's also possible for the float to be defective and not float properly. Two more things to check.

Dave
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Old 04-05-2008, 11:28 AM   #6 (permalink)
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What kinda vaccum are you pulling?
Also I would ditch that air filter. I have seen a few of them catch fire. Running rich is the last comment from the owner.
Also give your plugs a reading too. You may have fowled the plugs to a point that nothing will change with your tuning. If they smell like gas; get a new set of autolites and restart your tuning.
Check manifold torque and carb base gaskets.
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Old 04-05-2008, 12:09 PM   #7 (permalink)
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I have a 67 F./B, 289, 4 bbl Autolite 4100, A/T that runs great, doesn't foul the plugs, has the correct Vacuum, everything else seems to check out fine, yet the car exhaust stinks like hell! Also doesn't get great mileage. I, too, have thought it's running rich, but, when I'm at a cruise or show, almost all the classics stink the same!! HMMMM- could there be a connection there Maybe the old cars just smell more than the new cars!
I finally decided to follow the rule---If it ain't broke, don't fix it!! If the car smells a little, SO WHAT! If the garage smells a little, so I keep the door open for a few minutes after I pull the car in. Small price to pay for driving a classic!
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Old 04-05-2008, 10:58 PM   #8 (permalink)
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Thanks again folks!

I rebuilt the carb just two weeks ago and I was very careful when I set the dry float adjustment. I used a Echlin kit and the best gaskets I could find...I don't like the paper thin mounting gaskets you get with the rebuild kits.

BUT! today I finally got around to installing my Accel electronic points conversion kit with new Neihoff Cap and WOW! what a difference...the idle was smoother and I had less of that odor.

I also installed a electric choke housing and it works perfect!

This weekend I'm heading to my buddies place and were gonna do the leakdown, vacume and compression test and see where this 302 sits.

So far its quiet under the hood and runs fine.
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